unacceptable levels of pollution 难以接受的污染程度

This sort of behaviour is quite unacceptable in a civilized society. 这种行为在文明社会是无法容忍的。

+to sb The industry’ s proposals were politically unacceptable to the government. 从政治角度看，政府是不会接受该行业的提议的。

find sth unacceptable (=think it is wrong) Many viewers find the amount of violence on TV unacceptable. 认为某事是错误的

+to Bush’ s proposals were unacceptable to most environmentalists. 布什的提议在大多数环境保护主义者看来是错误的。

To some critics, the big fast-food chains represent the unacceptable face of consumerism. 对一些爱挑剔的人来说，大型的快餐连锁店代表了消费主义的阴暗面。